Card reader

1. A card reader having a magnetic head which abuts on a card to read magnetic information recorded on said card and/or write magnetic information on said card and mounted in a host device for use, comprising: an anterior frame in which an insertion slot for said card is formed; a main body frame fixed to said anterior frame; a control board to which said magnetic head is electrically connected; and a sealing member which is formed to be annular and is arranged between said anterior frame and said main body frame; wherein an insertion direction of said card is a first direction; wherein said main body frame is provided with: a head arrangement in which said magnetic head is arranged; a card cage which houses a first direction side of said card when the card is inserted into the insertion slot; and a seal arrangement which is formed between said head arrangement and said card cage, and in which said sealing member is positioned such that an inner circumference of said sealing member makes contact with the seal arrangement; wherein said anterior frame is provided with: a front face portion that forms an anterior of said card reader; and a substantially cylindrical cylinder portion which connects to said front face portion, and extends from said front face portion toward said first direction; wherein said head arrangement is positioned on the inner circumferential side of said cylinder portion; wherein said insertion slot is formed in said front face portion such that said card inserted from said insertion slot passes on the inner circumferential side of said cylinder portion; wherein a first direction end side portion of said cylinder portion is formed as a seal crushing portion that crushes said sealing member in a radial direction from an outer circumferential side of said sealing member; wherein said control board is arranged outside said card cage so as to be closer to said first direction side than said seal arrangement; and wherein an inner circumferential face of said seal crushing portion is formed in a tapered shape fanning out in a radial direction of said seal crushing portion as toward said first direction.

2. The card reader as set forth in claim 1 ; wherein the inner circumferential contact face of said seal arrangement, with which the inner circumference of said sealing member makes contact, is formed to be a convex surface that swells outwardly in the radial direction of the seal arrangement.

3. The card reader as set forth in claim 1 ; wherein an end portion contact surface, with which said first direction end of said sealing member makes contact, is formed on said first direction end side of said seal arrangement.

4. The card reader as set forth in claim 3 ; wherein a seal arrangement groove, in which said sealing member is arranged, is created in said seal arrangement.

5. The card reader as set forth in any of claim 1 ; wherein said main body frame includes a first frame and a second frame which are divisions in a thickness direction of said card; wherein said first frame is provided with a first cage frame portion that forms part of said card cage; wherein said second frame is provided with a second frame portion that, together with said first cage frame portion, forms said card cage; and wherein a sealing material is applied to a joint portion that joins said first cage frame portion and said second cage frame portion together to seal said joint portion.

6. The card reader as set forth in claim 5 ; wherein an outer circumferential end wail which stands upright in the thickness direction of said card is formed at an outer circumferential end of said first cage frame portion; wherein said first cage frame portion and said second cage frame portion are joined together under the condition where an outer circumferential end of said second cage frame portion is positioned on an inner circumferential face side of said outer circumferential end wall; and wherein a sealing material filling groove for filling said sealing material is formed along said outer circumferential end wall at an outer circumferential side portion of said first cage frame portion and said second cage frame portion which is said joint portion.

7. The card reader as set forth in any of claim 1 ; wherein passing holes, through which cables pulled out of said magnetic heads pass to be connected to said control board, are formed closer to an inner circumferential side of said seal arrangement than said sealing member; and wherein a sealing material is filled in said passing holes to seal said passing holes.

8. The card reader as set forth in any of claim 1 ; wherein a partition wall is formed between said card cage and said seal arrangement; wherein through holes are formed to said partition wall so that screws used to fasten said main body frame to said anterior frame pass through; and wherein said through holes are arranged radially outside said sealing member.

9. The card reader as set forth in any of claim 1 ; wherein said front face portion is positioned in an opening portion formed in a front panel of said host device, forming part of said front panel; wherein a display panel is formed in said front face portion to display the operation status of said card reader,; wherein a light source is mounted on said control board; and wherein, in said anterior frame, a light-guiding portion is formed radially outside said cylinder portion to guide light emitted from said light source to said display panel.

10. The card reader as set forth in any of claim 1 ; wherein a card detection mechanism is provided to detect that said card is housed in said card cage; wherein said card detection mechanism is provided with: an optical sensor having a light-emitting device and a light-receiving device; and a light-shielding member which intercepts light emitted from said light-emitting device to said light-receiving device; and wherein said sensor is arranged outside said card cage and said light-shielding member is arranged inside said card cage.

11. The card reader as set forth in claim 10 ; wherein said light-shielding member is formed by a flat spring.

12. The card reader as set forth in claim 10 ; wherein said card cage is formed of a light-transmitting member which transmits light emitted from said light-emitting device.

13. The card reader as set forth in claim 1 ; wherein said card cage is transparent or semi-transparent.

14. The card reader as set forth in claim 11 , wherein said card cage is formed of a light-transmitting member which transmits light emitted from said light-emitting device.